CSIR NET-JRF Electronics Past Papers PDF

CSIR NET-JRF QIP Series Physics by fiziks 06 Electronics and Experimental Methods 7. Op-Amp Integrator, Differentiator, Rectifier Q1. In the op-amp circuit shown in the fi...

CSIR NET-JRF QIP Series Physics by fiziks 06 Electronics and Experimental Methods 7. Op-Amp Integrator, Differentiator, Rectifier Q1. In the op-amp circuit shown in the figure, Vi is a 0.01F sinusoidal input signal of frequency 10 Hz and V0 is the output signal. The magnitude of the gain and the phase shift, respectively, close to the values 10 K (a) 5 2 and  / 2 1K Vi  (b) 5 2 and   / 2 Vo (c) 10 and zero  (d) 10 and π NET/JRF (DEC-2012) Q2. Consider the op-amp circuit shown in the figure. 1 F If the input is a sinusoidal wave Vi  5 sin 1000t  , then the amplitude of the output V0 is 1K 5 1K (a) (b) 5 Vi  Vo 2 5 2  (c) (d) 5 2 2 NET/JRF (DEC-2013) Q3. The gain of the circuit given below is 1/  RC. C R V Vin  a Vout  b V ground The modification in the circuit required to introduce a dc feedback is to add a resistor (a) Between a and b (b) Between positive terminal of the op-amp and ground (c) In series with C (d) Parallel to C NET/JRF (JUNE-2017) Q4. In the following operational amplifier circuit Cin  10 nF , Rin  20 k , RF  200 k  and CF  100 pF. Revised Edition-2022 13 H.No. 40-D, G.F., Jia Sarai, Near IIT, Hauz Khas, New Delhi-16 Phone: 011-26865455/+91-9871145498, Website: www.physicsbyfiziks.com, Email: [email protected]  CSIR NET-JRF QIP Series Physics by fiziks 06 Electronics and Experimental Methods RF CF Ri Ci  Vin Vout  The magnitude of the gain at a input signal frequency of 16 kHz is (a) 67 (b) 0.15 (c) 0.3 (d) 3.5 NET/JRF (JUNE-2017) Q5. The input Vi to the following circuit is a square wave as shown in the following figure Vi T /2 T C R  0, 0  t  V  Which of the waveforms V0 best describes the output? Vo Vo T /2 T (a) (b)  0, 0  t  0, 0  T T /2 t Vo Vo T /2 T T /2 T (c) (d)  0, 0   0, 0  t t NET/JRF (JUNE-2018) Q6. In the circuit shown below, the gain of the op-amp in the middle of its bandwidth is 105. A sinusoidal voltage with angular frequency   100 rad/s is applied to the input of the op--amp. R2  4 k  C5F vin  R1  2 k  vout  The phase difference between the input and the output voltage is 14 Revised Edition-2022 H.No. 40-D, G.F., Jia Sarai, Near IIT, Hauz Khas, New Delhi-16 Phone: 011-26865455/+91-9871145498, Website: www.physicsbyfiziks.com, Email: [email protected]  CSIR NET-JRF QIP Series Physics by fiziks 06 Electronics and Experimental Methods (a) 5 / 4 (b) 3 / 4 (c)  / 2 (d)  NET/JRF (JUNE-2020) Q7. If the parameters y and x are related by y  log  x  , then the circuit that can be used to produce an output voltage V0 varying linearly with x is (a) y (b) y   Vo Vo   (c) (d) y  y  Vo Vo   NET/JRF (DEC-2015) Q8. The I -V characteristics of the diode D in the circuit below is given by  kqVT  I  I s  e B  1     where I s is the reverse saturation current, V is the voltage across the diode and T is the absolute temperature. D R Vin  Vout  If the input voltage is Vin , then the output voltage Vout is  qV  1  q Vin  I S R   (a) I S R ln  in  1 (b) k B T ln    k BT  q  kBT  1 V  1 V  (c) k B T ln  in  1 (d)  k B T ln  in  1 q  IS R  q  IS R  NET/JRF (JUNE-2020) ------------------------------------------------------------------------------------------------------------ Revised Edition-2022 15 H.No. 40-D, G.F., Jia Sarai, Near IIT, Hauz Khas, New Delhi-16 Phone: 011-26865455/+91-9871145498, Website: www.physicsbyfiziks.com, Email: [email protected]